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Avalanche Forecast

Archived

Apr 1st, 2021–Apr 2nd, 2021

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Kootenay Boundary.

Wind slabs at uppermost elevations are the main concern.

Confidence

High -

Weather Forecast

Thursday Night: Cloudy with clear periods. Ridgetop wind moderate southwest. Alpine temperatures near -6 and freezing level 800 m. 

Friday: Mainly cloudy with sunny periods. Ridgetop wind light to moderate southwest. Alpine temperatures near -3 and freezing levels 1900 m. 

Saturday: Cloudy with clear periods. Ridgetop wind moderate from the southwest. Alpine temperatures near -2 and freezing level 2000 m.

Sunday: Flurries. Ridgetop wind moderate west. Alpine temperatures near -4 and freezing level 1600 m. 

Avalanche Summary

Reports from the past two days are limited to loose wet avalanches to size 1 from steep terrain facing the sun.

Reports on Tuesday show a few thin wind slab releases to size 1 and sluffing to size 1 from steep terrain facing the sun.

Snowpack Summary

New snow from earlier in the week has been redistributed by winds at upper elevations or impacted by the sun and relatively high freezing level over the past few days. Dry snow can be found 1600 m and above on north aspects. The snow surface is likely moist or a crust on all aspects to ridgetop except north. The lower snowpack below is well settled.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • As surface loses cohesion due to melting, loose wet avalanches become common in steeper terrain.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.